Autodial ISP using Firefox

I saw the thread a few days ago and thought the answer to my problem was there. Unfortunately having tried Dorsai's fix I still cannot get it to work. With Firefox I get "Error 623 The system could not find the phone book entry for this connection"

Am using XP with SP2 and a broadband connection from Onetel. With IE no problem, the dial up connection appears. As a workround, I have set up a new Dial Up icon on the desktop so that once I have connected, I can logon to Firefox. It would be nice to omit the extra click.